I have a dz77sl-50k with a gtx650 and it works fine, but recently I bought a rx570 and I cant make my mobo detect it, have tryed almost everything, some ppl are saying around to update my bios but bios download on intel website arent available anymore.
I Tested my gtx650 running on a riser x1 x16 adapter and it works, but still dont detect the rx570
Yes,6+2 pins are connected
2x ddr3 4gb ram
I7 3770k low OCed
I doubt that the bios update will correct it, but you can certainly try. And, the announcement on the Desktop Boards forum says that these files have all been removed. So, you will have to look elsewhere for these files.
I caution you about using 3rd party download sites, although that may be your only choice, unless a forum member has the file and can post it for you.